diff options
| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2017-12-21 12:02:28 +0100 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2018-01-05 10:00:14 +0100 |
| commit | a1c55bccf6004ec9fbcf892328f9658767aa22bb (patch) | |
| tree | 896798b2ffec527af77be4dba6e28902dbeb9de0 /drivers/gpu | |
| parent | dt-bindings: panel: lvds: Document power-supply property (diff) | |
| download | linux-a1c55bccf6004ec9fbcf892328f9658767aa22bb.tar.xz linux-a1c55bccf6004ec9fbcf892328f9658767aa22bb.zip | |
drm/panel: lvds: Add support for the power-supply property
A significant number of panels need to power up a regulator in order to
operate properly. Add support for the power-supply property to enable and
disable such a regulator whenever needed.
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/0c0819bdf88fa948188df95e57a10820a8a4548d.1513854122.git-series.maxime.ripard@free-electrons.com
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-lvds.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c index e2d57c01200b..57e38a9e7ab4 100644 --- a/drivers/gpu/drm/panel/panel-lvds.c +++ b/drivers/gpu/drm/panel/panel-lvds.c @@ -17,6 +17,7 @@ #include <linux/module.h> #include <linux/of_platform.h> #include <linux/platform_device.h> +#include <linux/regulator/consumer.h> #include <linux/slab.h> #include <drm/drmP.h> @@ -39,6 +40,7 @@ struct panel_lvds { bool data_mirror; struct backlight_device *backlight; + struct regulator *supply; struct gpio_desc *enable_gpio; struct gpio_desc *reset_gpio; @@ -69,6 +71,9 @@ static int panel_lvds_unprepare(struct drm_panel *panel) if (lvds->enable_gpio) gpiod_set_value_cansleep(lvds->enable_gpio, 0); + if (lvds->supply) + regulator_disable(lvds->supply); + return 0; } @@ -76,6 +81,17 @@ static int panel_lvds_prepare(struct drm_panel *panel) { struct panel_lvds *lvds = to_panel_lvds(panel); + if (lvds->supply) { + int err; + + err = regulator_enable(lvds->supply); + if (err < 0) { + dev_err(lvds->dev, "failed to enable supply: %d\n", + err); + return err; + } + } + if (lvds->enable_gpio) gpiod_set_value_cansleep(lvds->enable_gpio, 1); @@ -196,6 +212,13 @@ static int panel_lvds_probe(struct platform_device *pdev) if (ret < 0) return ret; + lvds->supply = devm_regulator_get_optional(lvds->dev, "power"); + if (IS_ERR(lvds->supply)) { + ret = PTR_ERR(lvds->supply); + dev_err(lvds->dev, "failed to request regulator: %d\n", ret); + return ret; + } + /* Get GPIOs and backlight controller. */ lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable", GPIOD_OUT_LOW); |